code cleanup

Author: thurka

visualvm/jmx/src/org/graalvm/visualvm/jmx/impl/JmxApplicationProvider.java

@@ -388,7 +388,7 @@ public boolean accept(File dir, String name) {
                 Storage storage = new Storage(file, PROPERTIES_FILE);
                 Set<Storage> storageSet = persistedApplications.get(storage.getCustomProperty(PROPERTY_HOSTNAME));
                 if (storageSet == null) {
-                    storageSet = new HashSet<Storage>();
+                    storageSet = new HashSet<>();
                     persistedApplications.put(storage.getCustomProperty(PROPERTY_HOSTNAME), storageSet);
                 }
                 storageSet.add(storage);

visualvm/jmx/src/org/graalvm/visualvm/jmx/impl/JmxConnectionConfigurator.java

@@ -193,8 +193,7 @@ private void updateSelectedCustomizer() {
     }
 
     private void updateOkButton() {
-        okButton.setEnabled(displayedPanel != null &&
-                displayedPanel.settingsValid() ? true : false);
+        okButton.setEnabled(displayedPanel != null && displayedPanel.settingsValid());
     }
 
     private void updateHint() {